If you've ever missed a shot because your stone picked, then you know how frustrating it can be to play without clean ice. Keeping the ice clean of dirt and grime is Curling 101. If you don't have a dedicated pair of shoes for curling, you really should. Put your curling shoes on in the locker room and don't step outside the club with them on. Some degree of dust and dirt is unavoidable, but you should think about your ice surface the moment you step in the club. Inspect your shoes often for grit and rocks. If you are using a broom with bristles, then please consider a new broom. There are several new canvas type brushes that are much more effective.
It takes only about 3 seconds for your warm hands to make a lasting impression on the ice. After your shot, you should watch where you put your hands to make sure they aren't resting on the ice. The same thing goes for knees. Kneeling on the ice after your shot is poor form. Lots of people don't have the leg strength to slide out properly, but that doesn't give you a pass to kneel on the ice. Stand up as soon as you can to avoid damaging the playing surface. And whatever you do, don't even think about laying on the ice. If a curler has a minor slip, help them stand as soon as possible. It's most important for their safety, but it also protects the ice. Major falls would be an exception where safety is the only concern.
The only reason a rock should ever be lifted from the ice is if an ice technician is flooding the playing surface. Lifting a rock during a game is dangerous and totally unnecessary. Some older throwing styles use a rock lift as part of the shot delivery. These shot methods are outdated because they use the weight of the rock as momentum. Newer release methods use the hips and center of gravity to propel the rock down the ice. These methods allow for greater speeds and more accurate throws. If you are a curler that uses the older method, consider changing to a no-lift delivery. Your back and knees will thank you!